What type of contacts does a current relay have?

A current relay is designed to monitor the flow of current within a circuit and typically operates through normally open contacts. When the current reaches a predefined level, the relay closes these contacts, allowing the circuit to be completed and triggering the desired action, such as starting or stopping a compressor in refrigeration applications.

This design is effective because it ensures that the relay only activates in response to the specified current conditions, providing protective measures against potential overloads or other electrical faults. The characteristics of normally open contacts mean that they do not conduct electricity until activated, which is essential for applications requiring precise control based on current levels. This ensures safe and efficient operation of electrical systems in HVAC and refrigeration environments.